I have been sewing masks for a couple of weeks. Some have elastic, some have ties. Everything except the elastic is cotton. I have a huge stash of quilting cotton being used. A local county group is requesting 1000 face masks a week, and the kits they are supplying ask for elastic if you have it, or anything if you don't! These are going to nursing homes, health workers. I will be taking a variety of masks to my dermatologist's office this week. I have given them to grocery store workers, the postman, or those who ask me if I have a spare one to gift them. I think this will answer @contentandwell's question.
Ginger